Shadows/Highlights not working anymore

Branch: gtk3
Version: 4.2.1234
Windows 64 Bit

Since upgrading to 4.2.1234, the “Shadows/Highlights” function does not work anymore (was OK in 4.0):
In previous versions, there was an “activate” box plus a “Shadows/Highlights” box. The first one is no longer there.
I can activate and deactivate clicking on the box “Shadows/Highlights”, but changing any settings do not have any effect. Am I doing anything wrong?

Apparently. Do you really click here?

HTH
Flössie

Ahhh, now. Thank you!

I was using the other user interface design (“Systemoberfläche”). The on-off symbol is not visible there (grey on grey), at least not on my screen.